Data


Tire pressure/ psi


33


35


31


34


27


25


31


28


30


33


30


31


29


32


28






Mean from frequency distribution


Grade bins Freq RF or P(x) x*p(x)
168 112 __________ __________
316 658 __________ __________
464 1172 __________ __________
612 332 __________ __________
760 123 __________ __________
Sums: _____ __________ __________








Linear regression


Pressure/PSI Load/lbs

20 992

23 1062

26 1123

29 1183

32 1243

35 1302